<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    let array = [15, 19, 20, 33, 18, 24]
    let sum = 0
    // let average = 0
    for (let i = 0; i < array.length; i++) {
      sum += array[i]

    };
    console.log(`平均年龄是${sum / array.length}`);

  </script>
</body>

</html>